Major DSS Datasets Which Contain Snow Depth or Cover

Dataset	Title	Date Range	Observation Frequency	Update Cycle	Coverage	Format
Ds464.0	NCEP ADP Global Surface Observations, February 1975 - continuing	1975-Cont	Hourly in the later years, 3-6 hourly in earlier periods	Monthly, we are about 1 month behind real time	Global, land surface stations	Format is on29
Ds463.3	NCDC TD3505 Integrated Surface Hourly Data, 1901-continuing (Known as ISD now)	1901-Cont	Hourly in the later years, 3-6 hourly in earlier periods	We get updates quarterly, but the dataset is updated daily by NCDC	Global, land surface stations	NCDC ISH ASCII format
Ds467.0	AWS TD13 Global Surface Observations, daily 1901-1973	1901-1973	Primarily 3-8 hourly, some 1 hour	None	Global, land surface stations	Packed binary, also in the original TD13 format
Ds472.0	TDL U.S. and Canada Surface Hourly Observations, daily 1976Dec-cont	1977-Cont	Hourly	Semi-annually	North America, some Central America	ASCII
Ds475.0	U.S.S.R. Surface 6- and 3-hourly Surface Synoptic Observations 1936-1983	1936-1983	3-6 hourly	None	USSR, over 200 stations	ASCII
Ds487.0	Canadian Hourly Surface Data Subset, 1947-1973	1947-1973	Hourly	None	Canada, snow depth reported only for 300 primary stations	Packed binary and ASCII formats are available
Ds509.0	NCDC TD3210 U.S. First Order Summary of Day, 1884(1948)-continuing	1948-Cont some stations report as early as 1884	Summary of the day	Annually	U.S., 1^st order stations, currently about 630 stations reporting	ASCII
Ds510.0	NCDC TD3200 U.S. Cooperative Summary of Day, 1890(1948)-cont	1948-Cont, some stations report as early as 1890	Summary of day	Annually	U.S. Coop stations, currently about 8,500 station reporting	ASCII
Ds511.0	CDIAC U.S. Historical Climatology Network (HCN) Daily Temperature, Precipitation, and Snow Observations for 1871-1997	1871-1997	Summary of day	None	U.S., 1062 stations in the lower U.S., these stations are part of the U.S. Historical Climate Network	ASCII
Ds512.0	CPC Global Summary of Day/Month Observations, 1979-continuing	1979-Cont, snow depth does not start until 1994	Summary of day, month	Annually	Global land surface stations	ASCII
Ds516.2	Canada Summary of Day, 1840-1991	1840-1991, snow depth starts in 1955	Summary of day	None	Canada, snow depth avaialbe for 300 primary stations Probably not much difference b/w this dataset and ds487.0	ASCII